Rep. Peter DeFazio (D-Ore.) on Tuesday coasted to an easy win, predictably crushing his 24-year-old opponent Matthew Robinson, the son of DeFazio's once and future Republican opponent, Art Robinson.

DeFazio won 90 percent of the vote in Oregon's 4th Congressional District, and led by as much as 94 percent in his home territory of Lane County, according to The Register-Guard. With the younger Robinson, a graduate student in nuclear engineering at Oregon State University, soundly defeated, DeFazio can turn his attentions to the race in November.

DeFazio, Oregon's most senior member of Congress, has served in the House since 1987 and is a top Democrat on two powerful congressional subcommittees on transportation and natural resources. His Republican challenger, Art Robinson, is a chemist who for the past 25 years has written a monthly energy newsletter he has described as "pro-science, pro-technology, pro-free enterprise." He ran against DeFazio in 2010, winning 45 percent of the vote.

DeFazio was the only one of Oregon's five congressional incumbents to face opposition in the primary.